Digital Broadcast Clock Synchronization via Compressed Preamble Extraction
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Solution Overview
Problem
In IP transmission schemes, such as ATSC 3.0, a method for correct clock synchronization between the sending and receiving sides has not been established, posing challenges in content redelivery.
Innovation Solution
A data processing apparatus and method that receive and process digital broadcast signals, extracting and sending clock information, like PTP, to ensure presentation synchronization, with the clock information being compressed and included in the digital broadcast signal to facilitate accurate synchronization across transmission paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IP transmission scheme is used for digital broadcasting, then transmission flexibility and network compatibility are improved, but clock synchronization accuracy deteriorates
Solution Approach 1:
The patent introduces clock information as an intermediary element that is extracted from the broadcast signal and transmitted separately to the receiving end. This clock information acts as a mediator between the sending and receiving sides, enabling synchronization without requiring the clock signal to be embedded within the IP packet transmission itself, thus resolving the contradiction between transmission flexibility and synchronization accuracy
Solution Approach 2:
The patent extracts clock information from the digital broadcast signal and transmits it separately through the IP transmission path. By taking out the clock information from the main content stream and handling it as a separate synchronization channel, the system maintains the flexibility of IP transmission while ensuring accurate clock synchronization through dedicated clock information delivery
2Measurement precision
If clock information is transmitted separately for synchronization, then synchronization accuracy is improved, but transmission complexity increases
Solution Approach 1:
The patent makes the IP transmission path serve multiple functions: it carries both the content data and the clock information for synchronization. By making the transmission path universal, the system avoids adding separate dedicated synchronization channels, thus improving synchronization accuracy without proportionally increasing transmission complexity
Solution Approach 2:
The patent merges the clock information transmission with the existing IP transmission infrastructure. Instead of adding completely separate synchronization channels, the system combines clock information delivery with the content transmission path, reducing overall system complexity while maintaining synchronization accuracy
Data Source
AI summary
The present technology relates a television apparatus that comprises circuitry configured to receive a digital broadcast signal, extract a packet including content included in the digital broadcast signal, extract time information included in a preamble of a physical layer frame, and send the time information and the packet including the content to other circuitry in the television apparatus. The television apparatus includes a transmission interface configured to interconnect the circuitry and the other circuitry. The television apparatus is further configured to process signaling that includes the time information that is comprised in the preamble of the physical layer frame in the digital broadcast signal.